Italy's Vincenzo Nibali won Stage 13 of the Tour de France to increase his hold on the yellow jersey.

'The Shark' pulled away from the rest of the field on the final climb to forge a three minutes 39 seconds lead over his rivals.

Spaniard Alejandro Valverde is now second after a disastrous day for Team Sky's Richie Porte.

The Australian lost almost nine minutes on Nibali and has dropped out of the Top 10.